102409742 has 4 divisors (see below), whose sum is σ = 153614616. Its totient is φ = 51204870.

The previous prime is 102409733. The next prime is 102409793. The reversal of 102409742 is 247904201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 247904201 = 739 ⋅335459.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25602434 + ... + 25602437.

It is an arithmetic number, because the mean of its divisors is an integer number (38403654).

Almost surely, 2^102409742 is an apocalyptic number.

102409742 is a deficient number, since it is larger than the sum of its proper divisors (51204874).

102409742 is an equidigital number, since it uses as much as digits as its factorization.

102409742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51204873.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 102409742 is about 10119.7698590432. The cubic root of 102409742 is about 467.8576739878.

The spelling of 102409742 in words is "one hundred two million, four hundred nine thousand, seven hundred forty-two".